Puzzle



FIG. 1 is a top plan view of a puzzle in accordance with my design;

FIG. 2 is a front edge view of the puzzle of FIG. 1; the right edge view being a mirror image thereof; and,

FIG. 3 is a rear edge view of the puzzle of FIG. 1; the left edge view being identical thereto.

The bottom plan view forms no part of the design. 

The ornamental design for a puzzle, as shown and described. 